drawTextRSXform
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2130643004
Review-Url: https://codereview.chromium.org/2130643004
diff --git a/gm/drawatlas.cpp b/gm/drawatlas.cpp
index a906cbe..ba71eae 100644
--- a/gm/drawatlas.cpp
+++ b/gm/drawatlas.cpp
@@ -100,3 +100,68 @@
typedef GM INHERITED;
};
DEF_GM( return new DrawAtlasGM; )
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+#include "SkPath.h"
+#include "SkPathMeasure.h"
+
+static void draw_text_on_path_rigid(SkCanvas* canvas, const void* text, size_t length,
+ const SkPoint xy[], const SkPath& path, const SkPaint& paint) {
+ SkPathMeasure meas(path, false);
+
+ int count = paint.countText(text, length);
+ SkAutoSTArray<100, SkRSXform> xform(count);
+
+ for (int i = 0; i < count; ++i) {
+ SkPoint pos;
+ SkVector tan;
+ if (!meas.getPosTan(xy[i].x(), &pos, &tan)) {
+ pos = xy[i];
+ tan.set(1, 0);
+ }
+ xform[i].fSCos = tan.x();
+ xform[i].fSSin = tan.y();
+ xform[i].fTx = pos.x();
+ xform[i].fTy = pos.y();
+ }
+
+ canvas->drawTextRSXform(text, length, &xform[0], nullptr, paint);
+}
+
+DEF_SIMPLE_GM(drawTextRSXform, canvas, 510, 310) {
+ const char text[] = "ABCDFGHJKLMNOPQRSTUVWXYZ";
+ const int N = sizeof(text) - 1;
+ SkPoint pos[N];
+ SkRSXform xform[N];
+
+ canvas->translate(0, 30);
+
+ SkScalar x = 20;
+ SkScalar dx = 20;
+ SkScalar rad = 0;
+ SkScalar drad = 2 * SK_ScalarPI / (N - 1);
+ for (int i = 0; i < N; ++i) {
+ xform[i].fSCos = SkScalarCos(rad);
+ xform[i].fSSin = SkScalarSin(rad);
+ xform[i].fTx = x;
+ xform[i].fTy = 0;
+ pos[i].set(x, 0);
+ x += dx;
+ rad += drad;
+ }
+
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ paint.setTextSize(20);
+ canvas->drawTextRSXform(text, N, xform, nullptr, paint);
+
+ SkPath path;
+ path.addOval(SkRect::MakeXYWH(150, 50, 200, 200));
+
+ draw_text_on_path_rigid(canvas, text, N, pos, path, paint);
+
+ paint.setStyle(SkPaint::kStroke_Style);
+ canvas->drawPath(path, paint);
+}
+
+